comparison gcc/asan.h @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 84e7813d76e9
comparison
equal deleted inserted replaced
15:561a7518be6b 16:04ced10e8804
1 /* AddressSanitizer, a fast memory error detector.
2 Copyright (C) 2011-2017 Free Software Foundation, Inc.
3 Contributed by Kostya Serebryany <kcc@google.com>
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #ifndef TREE_ASAN
22 #define TREE_ASAN
23
24 extern void asan_function_start (void);
25 extern void asan_finish_file (void);
26 extern rtx_insn *asan_emit_stack_protection (rtx, rtx, unsigned int,
27 HOST_WIDE_INT *, tree *, int);
28 extern rtx_insn *asan_emit_allocas_unpoison (rtx, rtx, rtx_insn *);
29 extern bool asan_protect_global (tree);
30 extern void initialize_sanitizer_builtins (void);
31 extern tree asan_dynamic_init_call (bool);
32 extern bool asan_expand_check_ifn (gimple_stmt_iterator *, bool);
33 extern bool asan_expand_mark_ifn (gimple_stmt_iterator *);
34 extern bool asan_expand_poison_ifn (gimple_stmt_iterator *, bool *,
35 hash_map<tree, tree> &);
36
37 extern gimple_stmt_iterator create_cond_insert_point
38 (gimple_stmt_iterator *, bool, bool, bool, basic_block *, basic_block *);
39
40 /* Alias set for accessing the shadow memory. */
41 extern alias_set_type asan_shadow_set;
42
43 /* Hash set of labels that are either used in a goto, or their address
44 has been taken. */
45 extern hash_set <tree> *asan_used_labels;
46
47 /* Shadow memory is found at
48 (address >> ASAN_SHADOW_SHIFT) + asan_shadow_offset (). */
49 #define ASAN_SHADOW_SHIFT 3
50 #define ASAN_SHADOW_GRANULARITY (1UL << ASAN_SHADOW_SHIFT)
51
52 /* Red zone size, stack and global variables are padded by ASAN_RED_ZONE_SIZE
53 up to 2 * ASAN_RED_ZONE_SIZE - 1 bytes. */
54 #define ASAN_RED_ZONE_SIZE 32
55
56 /* Shadow memory values for stack protection. Left is below protected vars,
57 the first pointer in stack corresponding to that offset contains
58 ASAN_STACK_FRAME_MAGIC word, the second pointer to a string describing
59 the frame. Middle is for padding in between variables, right is
60 above the last protected variable and partial immediately after variables
61 up to ASAN_RED_ZONE_SIZE alignment. */
62 #define ASAN_STACK_MAGIC_LEFT 0xf1
63 #define ASAN_STACK_MAGIC_MIDDLE 0xf2
64 #define ASAN_STACK_MAGIC_RIGHT 0xf3
65 #define ASAN_STACK_MAGIC_USE_AFTER_RET 0xf5
66 #define ASAN_STACK_MAGIC_USE_AFTER_SCOPE 0xf8
67
68 #define ASAN_STACK_FRAME_MAGIC 0x41b58ab3
69 #define ASAN_STACK_RETIRED_MAGIC 0x45e0360e
70
71 #define ASAN_USE_AFTER_SCOPE_ATTRIBUTE "use after scope memory"
72
73 /* Various flags for Asan builtins. */
74 enum asan_check_flags
75 {
76 ASAN_CHECK_STORE = 1 << 0,
77 ASAN_CHECK_SCALAR_ACCESS = 1 << 1,
78 ASAN_CHECK_NON_ZERO_LEN = 1 << 2,
79 ASAN_CHECK_LAST = 1 << 3
80 };
81
82 /* Flags for Asan check builtins. */
83 #define IFN_ASAN_MARK_FLAGS DEF(POISON), DEF(UNPOISON)
84
85 enum asan_mark_flags
86 {
87 #define DEF(X) ASAN_MARK_##X
88 IFN_ASAN_MARK_FLAGS
89 #undef DEF
90 };
91
92 /* Return true if STMT is ASAN_MARK with FLAG as first argument. */
93 extern bool asan_mark_p (gimple *stmt, enum asan_mark_flags flag);
94
95 /* Return the size of padding needed to insert after a protected
96 decl of SIZE. */
97
98 static inline unsigned int
99 asan_red_zone_size (unsigned int size)
100 {
101 unsigned int c = size & (ASAN_RED_ZONE_SIZE - 1);
102 return c ? 2 * ASAN_RED_ZONE_SIZE - c : ASAN_RED_ZONE_SIZE;
103 }
104
105 extern bool set_asan_shadow_offset (const char *);
106
107 extern void set_sanitized_sections (const char *);
108
109 extern bool asan_sanitize_stack_p (void);
110
111 extern bool asan_sanitize_allocas_p (void);
112
113 /* Return TRUE if builtin with given FCODE will be intercepted by
114 libasan. */
115
116 static inline bool
117 asan_intercepted_p (enum built_in_function fcode)
118 {
119 return fcode == BUILT_IN_INDEX
120 || fcode == BUILT_IN_MEMCHR
121 || fcode == BUILT_IN_MEMCMP
122 || fcode == BUILT_IN_MEMCPY
123 || fcode == BUILT_IN_MEMMOVE
124 || fcode == BUILT_IN_MEMSET
125 || fcode == BUILT_IN_STRCASECMP
126 || fcode == BUILT_IN_STRCAT
127 || fcode == BUILT_IN_STRCHR
128 || fcode == BUILT_IN_STRCMP
129 || fcode == BUILT_IN_STRCPY
130 || fcode == BUILT_IN_STRDUP
131 || fcode == BUILT_IN_STRLEN
132 || fcode == BUILT_IN_STRNCASECMP
133 || fcode == BUILT_IN_STRNCAT
134 || fcode == BUILT_IN_STRNCMP
135 || fcode == BUILT_IN_STRCSPN
136 || fcode == BUILT_IN_STRPBRK
137 || fcode == BUILT_IN_STRSPN
138 || fcode == BUILT_IN_STRSTR
139 || fcode == BUILT_IN_STRNCPY;
140 }
141
142 /* Return TRUE if we should instrument for use-after-scope sanity checking. */
143
144 static inline bool
145 asan_sanitize_use_after_scope (void)
146 {
147 return (flag_sanitize_address_use_after_scope && asan_sanitize_stack_p ());
148 }
149
150 /* Return true if DECL should be guarded on the stack. */
151
152 static inline bool
153 asan_protect_stack_decl (tree decl)
154 {
155 return DECL_P (decl)
156 && (!DECL_ARTIFICIAL (decl)
157 || (asan_sanitize_use_after_scope () && TREE_ADDRESSABLE (decl)));
158 }
159
160 /* Return true when flag_sanitize & FLAG is non-zero. If FN is non-null,
161 remove all flags mentioned in "no_sanitize" of DECL_ATTRIBUTES. */
162
163 static inline bool
164 sanitize_flags_p (unsigned int flag, const_tree fn = current_function_decl)
165 {
166 unsigned int result_flags = flag_sanitize & flag;
167 if (result_flags == 0)
168 return false;
169
170 if (fn != NULL_TREE)
171 {
172 tree value = lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (fn));
173 if (value)
174 result_flags &= ~tree_to_uhwi (TREE_VALUE (value));
175 }
176
177 return result_flags;
178 }
179
180 #endif /* TREE_ASAN */